CWE-434 Unrestricted File Upload: How It Happens and How to Fix It
Let users upload files without limits and one of them may be a web shell. CWE-434 explained, with vulnerable and fixed PHP examples.
Deep dives, practical guides, and incident analyses from engineers who build Safeguard. No fluff, no vendor FUD — just what you need to ship secure software.
Let users upload files without limits and one of them may be a web shell. CWE-434 explained, with vulnerable and fixed PHP examples.
Code and config files under the web root with an unhandled extension get served as plain text, credentials included. CWE-433 and how to prevent it.
Signal handlers that share state can interrupt each other and corrupt it. CWE-432 explains why handlers must block other signals while they run.
When no handler exists for an event or exception, the program loses its chance to decide what a failure means. CWE-431 and how to cover it.
When the wrong component processes a file or request, source code can leak and checks can be skipped. CWE-430 explained.
Stack several dots on the end of a path and some servers return a directory listing. A practical look at CWE-43 and its fixes.
An unquoted path with spaces can make Windows run C:\Program.exe instead of your program. CWE-428 explained, with the one line fix.
A search path that includes a directory attackers can write to, such as the current directory, lets them plant code your program will load. CWE-427 explained.
Programs that find executables or libraries through a path an attacker controls can be tricked into running the wrong code. CWE-426 explained.
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